Designed by owner Cantrell Johnson and decorated with decals of famed video-game characters, GameStar Mobile’s gaming trailer cruises down the thoroughfares of Indianapolis hitched to a pickup truck. In the trailer’s climate-controlled confines, up to 16 partygoers compete on a choice of four Xbox 360 consoles, four PlayStation 3s, and four Wiis, each hooked up to four controllers. Players tackle digital scenarios ranging from the science-fiction battles of Halo: Reach to the challenge of tying a cape to a guitar in Guitar Hero. As they press buttons and nosh on complimentary smoked brisket, gamers’ accomplishments project on an array of flat-screen HDTVs outfitted with surround-sound systems.